"An introduction to galaxies with information about their formation and characteristics. Includes diagrams, fun facts, glossary, resource list, and index"--Provided by publisher.

What is a galaxy? -- How many galaxies are there? -- Focus on: grouping galaxies -- What is a spiral galaxy? -- What is an elliptical galaxy? -- What is an irregular galaxy? -- Focus on: peculiar galaxies -- Do galaxies usually exist in groups? -- How large are galaxies? -- Which is the most distant galaxy? -- Focus on: the galaxy we live in -- What is the nearest galaxy to ours? -- Do galaxies move around? -- How fast does a galaxy move? -- Do galaxies ever merge? -- Focus on: colossal collisions -- Who discovered that galaxies exist? -- Why does a galaxy glow? -- How do astronomers use light to study galaxies? -- How do astronomers count galaxies? -- When did galaxies start to form? -- How did galaxies form? -- Are new stars forming in galaxies? -- Are galaxies forming now? -- Focus on: gravity: a galactic glue -- Can galaxies die? -- What are some remaining mysteries about galaxies?.